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25 April 2002Self-guiding in two-dimensional photonic crystals
Dielectric periodic media can possess a complex photonic band structure with allowed bands displaying strong dispersion and anisotropy. We show that for some frequencies the form of iso-frequency contours mimics the form of the first Brillouin zone of the crystal. A wide angular range of flat dispersion exists for such frequencies. The regions of iso-frequency contours with near zero curvature cancel out diffraction of the light beam, leading to a self-guided (self-collimated) beam.
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Dmitry N. Chigrin, Stefan Enoch, Cliva M. Sotomayor-Torres, Gerard Tayeb, "Self-guiding in two-dimensional photonic crystals," Proc. SPIE 4655, Photonic Bandgap Materials and Devices, (25 April 2002); https://doi.org/10.1117/12.463861